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Merge pull request #2178 from hamptonmoore/avigilon-56

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Implement Avigilon 56bit format
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Iceman 2023-11-27 14:55:33 +01:00 committed by GitHub
parent 7d9326c60d 345303de37
commit d8da2902fb
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1 changed files with 53 additions and 0 deletions
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53
client/src/wiegand_formats.c
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@ -1288,6 +1288,58 @@ static bool Unpack_bc40(wiegand_message_t *packed, wiegand_card_t *card) {
return true;
}
static bool step_parity_check(wiegand_message_t *packed, int start, int length, bool even_parity) {
bool parity = even_parity;
for (int i = start; i < start + length; i += 2) {
// Extract 2 bits
bool bit1 = get_bit_by_position(packed, i);
bool bit2 = get_bit_by_position(packed, i + 1);
// Calculate parity for these 2 bits
parity ^= (bit1 ^ bit2);
}
return parity;
}
static bool Pack_Avig56(wiegand_card_t *card, wiegand_message_t *packed, bool preamble) {
memset(packed, 0, sizeof(wiegand_message_t));
packed->Length = 56;
if (card->FacilityCode > 0xFFFFF) return false; // Can't encode FC.
if (card->CardNumber > 0x3FFFFFFFF) return false; // Can't encode CN.
set_linear_field(packed, card->FacilityCode, 1, 20);
set_linear_field(packed, card->CardNumber, 21, 34);
bool even_parity_valid = step_parity_check(packed, 0, 28, true);
set_bit_by_position(packed, !even_parity_valid, 0);
bool odd_parity_valid = step_parity_check(packed, 28, 28, false);
set_bit_by_position(packed, !odd_parity_valid, 55);
if (preamble)
return add_HID_header(packed);
return true;
}
static bool Unpack_Avig56(wiegand_message_t *packed, wiegand_card_t *card) {
memset(card, 0, sizeof(wiegand_card_t));
if (packed->Length != 56) return false;
card->FacilityCode = get_linear_field(packed, 1, 20);
card->CardNumber = get_linear_field(packed, 21, 34);
// Check step parity for every 2 bits
bool even_parity_valid = step_parity_check(packed, 0, 28, true);
bool odd_parity_valid = step_parity_check(packed, 28, 28, false);
card->ParityValid = even_parity_valid && odd_parity_valid;
return true;
}
// ---------------------------------------------------------------------------------------------------
void print_desc_wiegand(cardformat_t *fmt, wiegand_message_t *packed) {
@ -1414,6 +1466,7 @@ static const cardformat_t FormatTable[] = {
{"Casi40", Pack_CasiRusco40, Unpack_CasiRusco40, "Casi-Rusco 40-bit", {1, 0, 0, 0, 0}}, // from cardinfo.barkweb.com.au
{"C1k48s", Pack_C1k48s, Unpack_C1k48s, "HID Corporate 1000 48-bit std", {1, 1, 0, 0, 1}}, // imported from old pack/unpack
{"BC40", Pack_bc40, Unpack_bc40, "Bundy TimeClock 40-bit", {1, 1, 0, 1, 1}}, // from
{"Avig56", Pack_Avig56, Unpack_Avig56, "Avigilon 56-bit", {1, 1, 0, 0, 1}},
{NULL, NULL, NULL, NULL, {0, 0, 0, 0, 0}} // Must null terminate array
};